vertex diagram

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• Feynman diagram — The Wick s expansion of the integrand gives (among others) the following termNarpsi(x)gamma^mupsi(x)arpsi(x )gamma^ upsi(x )underline{A mu(x)A u(x )};,whereunderline{A mu(x)A u(x )}=int{d^4pover(2pi)^4}{ig {mu u}over k^2+i0}e^{ k(x x )}is the… …   Wikipedia

• Van Kampen diagram — In the mathematical area of geometric group theory, a van Kampen diagram is a planar diagram used to represent the fact that a particular word among the generators of a group given by a group presentation represents the identity element in that… …   Wikipedia

• Coxeter–Dynkin diagram — See also: Dynkin diagram Coxeter Dynkin diagrams for the fundamental finite Coxeter groups …   Wikipedia

• Hasse diagram — In the mathematical discipline known as order theory, a Hasse diagram (pronEng|ˈhɑːsə HAHS uh ), named after Helmut Hasse (1898 ndash;1979)) is a simple picture of a finite partially ordered set, forming a drawing of the transitive reduction of… …   Wikipedia

• Feynman diagram — Physics. a network of lines that represents a series of emissions and absorptions of elementary particles by other elementary particles, from which the probability of the series can be calculated. Also called Feynman graph. [1965 70; named after… …   Universalium

• Mathematical diagram — This article is about general diagrams in mathematics. For diagrams in the category theoretical sense, see Diagram (category theory). Euclid s Elements, ms. from Lüneburg, A.D. 1200 Mathematical diagrams are diagrams in the field of mathematics,… …   Wikipedia

• Voronoi diagram — The Voronoi diagram of a random set of points in the plane (all points lie within the image). In mathematics, a Voronoi diagram is a special kind of decomposition of a given space, e.g., a metric space, determined by distances to a specified… …   Wikipedia

• One-loop Feynman diagram — In physics, a one loop Feynman diagram is a connected Feynman diagram with only one cycle (unicyclic). Such a diagram can be obtained from a connected tree diagram by taking two external lines of the same type and joining them together into an… …   Wikipedia

• Trace diagram — In mathematics, trace diagrams are a graphical means of performing computations in linear and multilinear algebra. They can be represented as graphs with edges labeled by matrices. Without the matrix labels, they are equivalent to Penrose s… …   Wikipedia

• Renormalization — Quantum field theory (Feynman diagram) …   Wikipedia

• NP (complexity) — Diagram of complexity classes provided that P ≠ NP. The existence of problems outside both P and NP complete in this case was established by Ladner.[1] In computational complexity theory, NP is one of the most fundamental complexity classes. The… …   Wikipedia